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J. D.v RICHARDSON, Jr.,

El'cxetrloV Gall-Buell..

Patented Feb. 10, 1880. fly,

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WITNBS TOBNBYS.

N. PETERS. PHDTOLITHOGRAPHER. WASNXNGTONy ll CV UNITED STAT#ns @Price VJOHN D. RICHARDSON, JR., on NEWPORT, RHODE. ISLAND. l

ELQTRIGGutmann.

S1112:cnircA'rIolvf forming para of Letters Patent No. 224,477, dated February 1o, 1880.

To all whom it may concern: Be it known that LJoHN D. RICHARDSON, Jr., of Newport, in the county of Newport and State of Rhode Island, have invented a new and useful Improvement in Electric Gall-Bells, of which the following is a specification. My improvements relate to call-bells for telegraph and telepho/ne lines; and the object of the invention is to permit the operation from the central station of any one bell in the circuit, whereby one station may be called without giving an alarm at any of the others.

lThe invention consists in the use of .aseoond armature with each bell, arranged to require more battery-power for its operation than the armature operating the hammer, and to prevent by its movemen t the contact of theham' mer with the bell, which construction and operation I will more particularly describe with reference to the accompanying drawings, where-A m Figure l is a plan view, and Fig. 2 a vertical section, of my call-bell, and Fig. 3 is a diagram illustrating the arrangement of the circuit.

Similar letters of reference indicate corresponding parts. Y

A is the magnet, and B the bell, supported upon a standard, a, as shown, in any eonvenient manner. b is the armature, carrying the hammer c, and fitted with a retractile spring, d, the tension of which is adjustable by a nut, e.

The poles of the magnet Aare fitted with extensions f, that project at right' angles toward the ,bell B 5` and upon side arms, g, of the standard a is pivoted the second or stop arm ature h, that is tted with a retractile spring,i, adjustable by a screw-pin, k. The stop-screw l ofthe armature 71J is tapped in the bell-post, and sustains the armature atan angle of about forty-five degrees to the axis of the magnet, and

the projecting poles j' are formed with a faceat about the same angle. From the armature h a bent arm, m, having a forked outer end, Y extends in the path ofthe shank of hammer c,

and the parts are so adjusted that when the armature h is drawn to the magnet the arm m prevents movementof the armature b and hammer c.

Application led December 15, 1879.

To obtain the desiredoperation when a num- Jber of these bells are placed in one circuit, the retractile springt' of the stop-armature his to be adjusted so thatit will require more batterypower to draw it than is required for armature b, whereby there will be no hinderance to the operation of the bell by a weaker current. The spring of armature b in ea@ instrument will be stronger than the spring of the armature b in the instrument next before it, or nearer to the central station.

The battery at the central station will be arranged in sections with a switch, so that one or more sections can be thrown in circuit. The diagram, Fig. 3, illustrates the arrangement. D is the divided battery. E is a switch, con` nected to the sections ot' the battery and iitted with a moving arm, whereby one or more sections can be thrown upon the line; and F aresprings to receive a plug for closing the circuit to the distant stations,one of which is represented at G.

To call the first stationthe plug will be inserted in springs F and the arm of switch E turned to connect one section of the battery, giving current sufficient to operate armature b of the instrument of the rst station,and the signalmay then be given by the key H. The spring'of armature h at the first station being strong enough to resist the current, the armature, m ayworkand give the call, and there not being battery enough to work the bells at the other stations, they remain silent. If more battery be thrown on'the line to call the second station, the armature h of the first station will be moved and prevent the operation of the armature b at the rst station, and Vso on `to the last station, where the ,second armature will not be required.

` Having thus described myinvention, I claim yas new and desire to secure by Letters Patent- 1. In electric call-bells, a second armature `fitted as a stop to arrest the movementof the hammer, combined with aV magnet having its `poles extended and fitted to attract either or both armatures, all substantially as shown and described.

2. Inelectric call-bells,thecombination,with

magnet A, formed with the extension, poles f, of the armature b, carrying the bell-hammer, and the armature h, fitted with the arm m, that arrests the movement of the hammer when bothztrmzttures ere attracted, substantially as described andv shown. A Y

3. In telephone and telegraph lines containing cell-bells that require for their operation increase of current proportioned to their dis- 1 o tance from theeentratl station, the combination,

with each bell and magnet, of a stop-armature for preventing the cell, that is operative only when the current is sntieiently strong to 0perete the bell at zt more distant station, substantially as specified.

JOHN DEAN RICHARDSON, JR.

Witnesses Gmo. H. BAKKER, MELVILLE BULL. 

